Figure 39 shows the property sheet of an example Bacnet ProxyExt.
To deal with proprietary object types and properties, you can refer to the numerical codes supplied by the device vendor. Then click to highlight the Object Id, or the Property Id, and type in the needed numeric code. For example, a proprietary property 1000 may be included on some company’s analog input objects.
Or, if you have added the relevant enumeration value into the BacnetDevice’s Enumeration List property, you should be able
to select it by name (normally) from the drop-down list.
In addition to typical ProxyExt properties (refer to “ProxyExt properties” in the Drivers Guide), the proxy extension in Bacnet proxy points include these additional properties:
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Object Id
Consists of two fields: BACnet object type, and object instance number. Within any one object type in that device, instance numbers must be unique. See Object ID, also Note above.
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Property Id
BACnet property ID for the specific data item being proxied. Often, this is “Present Value.” See Property ID. If a proprietary property, see the preceding Note.
Do not change Property ID on an existing Bacnet proxy point. This can produce undesirable results, especially if a different control point
type would apply. Instead, make a new proxy point.
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Property Array Index
Index to a particular element in an arrayed property, if applicable. For example, if the point proxies priority level 7 of a priority array input of a Binary_Output point, this value is “7”. If not applicable to the property being proxied, this value is “-1”.
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Data Type
(read only) ASN primitive application data type, for example, “REAL” or “ENUMERATED.”
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Read Status
(read only) Indicates whether “Polled,” “COV,” or “Unsubscribed.” See Read.
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Write Status
(read only) Indicates “readonly” or “writable,” or some other value following a Niagara write. See Write for more details.